Abstract
This paper introduces two tools for manual energy evaluation and runtime tuning developed at IT4Innovations in the READEX project. The MERIC library can be used for manual instrumentation and analysis of any application from the energy and time consumption point of view. Besides tracing, MERIC can also change environment and hardware parameters during the application runtime, which leads to energy savings.
MERIC stores large amounts of data, which are difficult to read by a human. The RADAR generator analyses the MERIC output files to find the best settings of evaluated parameters for each instrumented region. It generates a 
report and a MERIC configuration file for application production runs.
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Notes
- 1.
Uncore frequency refers to frequency of subsystems in the physical processor package that are shared by multiple processor cores, e.g., L3 cache and on-chip ring interconnect.
- 2.
MERIC repository: https://code.it4i.cz/vys0053/meric.
- 3.
The Intel Haswell processors do not support floating-point instructions counters. MERIC approximates FLOPs/s based on the counter of Advanced Vector Extensions (AVX) calculation operations. For more information visit https://github.com/RRZE-HPC/likwid/wiki/FlopsHaswell.
- 4.
htop repository: https://github.com/hishamhm/htop.
- 5.
RADAR generator repository: https://code.it4i.cz/bes0030/readex-radar.
- 6.
ESPRESO library website: http://espreso.it4i.cz/.
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Acknowledgement
This work was supported by The Ministry of Education, Youth and Sports from the National Programme of Sustainability (NPU II) project “IT4Innovations excellence in science - LQ1602” and by the IT4Innovations infrastructure which is supported from the Large Infrastructures for Research, Experimental Development and Innovations project “IT4Innovations National Supercomputing Center – LM2015070”.
The research leading to these results has received funding from the European Union’s Horizon 2020 Programme under grant agreement number 671657.
The work was additionally supported by VŠB – Technical University of Ostrava under the grant SP2017/165 and by the Barcelona Supercomputing Center under the grants 288777, 610402 and 671697.
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Vysocky, O., Beseda, M., Říha, L., Zapletal, J., Lysaght, M., Kannan, V. (2018). MERIC and RADAR Generator: Tools for Energy Evaluation and Runtime Tuning of HPC Applications. In: Kozubek, T., et al. High Performance Computing in Science and Engineering. HPCSE 2017. Lecture Notes in Computer Science(), vol 11087. Springer, Cham. https://doi.org/10.1007/978-3-319-97136-0_11
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